From 6967cfe198517de6429440b45cb499ff42c088ba Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Thu, 28 May 2020 14:35:12 +0200 Subject: [PATCH] Bluetooth: Acquire sk_lock.slock without disabling interrupts [ Upstream commit e6da0edc24eecef2f6964d92fa9044e1821deace ] There was a lockdep which led to commit fad003b6c8e3d ("Bluetooth: Fix inconsistent lock state with RFCOMM") Lockdep noticed that `sk->sk_lock.slock' was acquired without disabling the softirq while the lock was also used in softirq context. Unfortunately the solution back then was to disable interrupts before acquiring the lock which however made lockdep happy. It would have been enough to simply disable the softirq. Disabling interrupts before acquiring a spinlock_t is not allowed on PREEMPT_RT because these locks are converted to 'sleeping' spinlocks. Use spin_lock_bh() in order to acquire the `sk_lock.slock'. Cc: stable-rt@vger.kernel.org Reported-by: Luis Claudio R. Goncalves Reported-by: kbuild test robot [missing unlock] Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Marcel Holtmann Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Steven Rostedt (VMware) --- net/bluetooth/rfcomm/sock.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c index 90bb53aa4bee..2c27aa2acf1c 100644 --- a/net/bluetooth/rfcomm/sock.c +++ b/net/bluetooth/rfcomm/sock.c @@ -64,15 +64,13 @@ static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb) static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err) { struct sock *sk = d->owner, *parent; - unsigned long flags; if (!sk) return; BT_DBG("dlc %p state %ld err %d", d, d->state, err); - local_irq_save(flags); - bh_lock_sock(sk); + spin_lock_bh(&sk->sk_lock.slock); if (err) sk->sk_err = err; @@ -93,8 +91,7 @@ static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err) sk->sk_state_change(sk); } - bh_unlock_sock(sk); - local_irq_restore(flags); + spin_unlock_bh(&sk->sk_lock.slock); if (parent && sock_flag(sk, SOCK_ZAPPED)) { /* We have to drop DLC lock here, otherwise